she’ll walk in two hours, so put 120 (60 × 2) minutes in the second half of the ratio: = .
To solve, cross-multiply, and you’ll get 50x = 2.5 × 120; 50x = 300; x = 6 miles, which is (C).
- C Since this is a ratio question, let’s draw a Ratio Box. We know the ratio for the votes for
Skinner and Whitehouse, and the total number of votes cast. Fill in the total by adding the ratio
(4 + 3 = 7), and then find the multiplier by seeing how many times 7 goes into 140,000
(140,000 ÷ 7 = 20,000).
Skinner Whitehouse Total
4 3 7
× 20,000 × 20,000 × 20,000
80,000 60,000 140,000
The question wants to know how many votes Whitehouse received, which is 60,000, (C).
- B This is a hard question, so you have to stay on your toes. If the owner buys 3 pounds of each
spice, that means she pays the following amounts for each spice:
cinnamon: $8 × 3 = $24
nutmeg: $9 × 3 = $27
ginger: $7 × 3 = $21
cloves: $10 × 3 = $30
So she pays a total of 24 + 27 + 21 + 30, or $102 for 12 pounds of spices. She then sells the
spices per ounce, so you have to figure out first how many ounces of spices she has. If 1 pound
is 16 ounces, then 12 pounds is 12 × 16, or 192 ounces. She sells all the spices at $2 per ounce,
so she makes 192 × $2, or $384. To figure out her profit, subtract the amount she paid for the
spices from the amount she made selling them: $384 – $102 = $282, (B).
- D The average gold content in the granite samples can be calculated as follows:
= 0.782
The average gold content in the gneiss samples can be calculated as
= 0.418
Because the average gold content in the granite samples is higher, you can eliminate (A) and
(C). Ballpark to find the right answer. 0.782 is almost twice as much as 0.418. Therefore,
granite contains, on average, almost 100% more gold than gneiss does. The correct answer is
(D).
